package cn.tedu.v3_1;

import java.io.*;
import java.net.*;
import java.util.*;

/**
 * 多人聊天室 Version 3.1
 *
 */
public class Server {
    private ServerSocket serverSocket;
    //
    private static final Integer PORT=9908;

    public Server() {
        try {
            serverSocket = new ServerSocket(PORT);
        } catch (BindException e) {//BindException    端口号已被占用
            System.out.println("请检查端口号，被占用~");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {
        try {
            while (true) {
                System.out.println("等待客户端连接");
                Socket socket = serverSocket.accept();
                new Thread(new ClientHandler(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("客户端连接失败了");
        } finally {
            if (serverSocket!=null&&serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败~~~");
                }
                System.out.println("服务器关闭成功~Over");
            }
        }
    }

    public static void main(String[] args) {
        new Server().start();
    }

    //ClientHandler多线程类:控制客户端发来的消息
    private class ClientHandler implements Runnable {
        private Socket socket;
        private String ip;
        private PrintWriter pw;
        private BufferedReader br;

        public ClientHandler(Socket s){
            //1.明确接入客户端 通讯类 Socket
            this.socket=s;
            //2.给明确接入的客户端，IP地址
            ip=socket.getInetAddress().getHostAddress();
            //3.给明确接入客户端，读写功能
            try {
                br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
            } catch (IOException e) {
                System.out.println("客户端断开练习了~");
            }
        }
        public void run() {

            try {


                new Thread(()->{
                    try {
                        String message;
                        while ((message= br.readLine())!=null) { //读入的客户端的
                            System.out.println(ip+"客户端说：" + message);//打印  客户端发来文本
                            System.out.print("服务器请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端发来的消息断开了");
                    }
                }).start();

                Scanner input=new Scanner(System.in);

                while(true){
                    System.out.println("服务器请输入：");
                    String sme= input.nextLine();
                    pw.println("服务器说："+sme);
                }
            } finally {
                if (pw!=null)
                    pw.close();
                if (br!= null)
                try {
                    br.close();
                } catch (IOException e) {
                    System.out.println("读入流断开连接");
                }
            //2.关闭CS多线程类中--运行的socket通讯类
            if (socket!=null&&!socket.isClosed()) {
                System.out.println(ip + "客户端退出服务器链接~");
                try {
                    socket.close();
                } catch (IOException e) {
                    System.out.println(ip + "客户端退出链接异常~");
                }
            }
            }
        }
    }
}